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    cata2's Avatar
    cata2 Posts: 3, Reputation: 1
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    #1

    Mar 20, 2010, 10:56 AM
    Condensation freezing around flue pipe collar on roof (gas furance)
    Condensation from gas furnace freezing around flue pipe.
    cata2's Avatar
    cata2 Posts: 3, Reputation: 1
    New Member
    		  
    #2

    Mar 20, 2010, 11:00 AM
    Condensation freezing around flue pipe collar on roof (gas furance)
    Condensation collects around gas flue pipe and freezes during very cold weather. What is causing this? It seems to collect around the collar. It has dripped down the pipe onto the unit.
    cata2's Avatar
    cata2 Posts: 3, Reputation: 1
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    #3

    Mar 20, 2010, 11:01 AM

    Condesndation collects around furnace flue pipe on roof. Freezes around the collar. What causes this?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Mar 20, 2010, 11:27 AM
    There is not enough heat in the furnace exhaust to carry the weight of the water created as a byproduct of burning the gas. The chimney will need a liner OR somehow insulated to prevent the condensation/moisture from falling out of suspension in the flue/exhaust gas.

    This problem needs to be addressed by a on site visit from a local HVAC professional that knows what he is doing.
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